A missing man who apparently fell into the bay from a pier near AT&T Park after a Giants game this week is a Southern California native who works in Vacaville as a prison guard, his family and friends said Thursday.

Victor Murillo, 27, was wearing his Dodgers jacket when he was last seen shortly after he watched his team play the Giants Monday night, authorities said.

Murillo and a friend walked back to their car in a parking lot on Piers 30-32 around 10:40 p.m., police said. The friend looked down at his phone to write a text message and when he looked up, Murillo was nowhere to be seen. The friend believes he fell into the water.

A joint search by San Francisco police and fire boats and a Coast Guard helicopter Monday night and Tuesday turned up no sign of Murillo.

Murillo works as a guard at the California Medical Facility in Vacaville, the largest hospital in the state prison system. He lives in Woodland (Yolo County) but left his heart and family in his hometown of Temple City (Los Angeles County), friends said Thursday.

He is a "huge Dodgers fan" who loves going to games and is an "amazing friend," said co-worker Anthony Ornelas. He also idolizes Michael Jackson and is "known for doing a little M.J. kick when he danced," Ornelas said.

Murillo dreamed of playing professional football, but injured himself while playing for Concordia University in Minnesota, said his sister, Vicky Simon. But he threw himself into his new career and kept an optimistic outlook, she said.

"He didn't light up the room with a smile, he lit up the room with his humor," she said.

Simon, who lives in San Diego with her husband and young son, flew to San Francisco on Tuesday after she heard the news of his disappearance. Some who know Murillo were so eager to help that they conducted their own searches in kayaks, she said.

Murillo does not know how to swim, Simon said.

"We're inseparable. He's my other half," she said. "We're a year and three months apart, but we'd lie and tell people we were twins."